[patch 0/6] Strong Access Ordering page attributes for POWER7 · <hidden> · 2008-06-18
[patch 3/6] powerpc: Define flags for Strong Access Ordering · <hidden> · 2008-06-18
[patch 4/6] powerpc: Add SAO Feature bit to the cputable · <hidden> · 2008-06-18
[patch 1/6] mm: Allow architectures to define additional protection bits · <hidden> · 2008-06-18
Re: [patch 1/6] mm: Allow architectures to define additional protection bits · Andrew Morton <akpm@linux-foundation.org> · 2008-07-01
Re: [patch 1/6] mm: Allow architectures to define additional protection bits · Dave Kleikamp <hidden> · 2008-07-01
Re: [patch 1/6] mm: Allow architectures to define additional protection bits · Benjamin Herrenschmidt <benh@kernel.crashing.org> · 2008-07-07
Re: [patch 1/6] mm: Allow architectures to define additional protection bits · Hugh Dickins <hidden> · 2008-07-07
Re: [patch 1/6] mm: Allow architectures to define additional protection bits · Benjamin Herrenschmidt <benh@kernel.crashing.org> · 2008-07-07
Re: [patch 1/6] mm: Allow architectures to define additional protection bits · Benjamin Herrenschmidt <benh@kernel.crashing.org> · 2008-07-08
Re: [patch 1/6] mm: Allow architectures to define additional protection bits · Hugh Dickins <hidden> · 2008-07-08
Re: [patch 1/6] mm: Allow architectures to define additional protection bits · Dave Kleikamp <hidden> · 2008-07-08
[patch 2/6] powerpc: hash_huge_page() should get the WIMG bits from the lpte · <hidden> · 2008-06-18
[patch 6/6] powerpc: Dont clear _PAGE_COHERENT when _PAGE_SAO is set · <hidden> · 2008-06-18
[patch 5/6] powerpc: Add Strong Access Ordering · <hidden> · 2008-06-18
Re: [patch 0/6] Strong Access Ordering page attributes for POWER7 · Benjamin Herrenschmidt <benh@kernel.crashing.org> · 2008-07-03
Re: [patch 0/6] Strong Access Ordering page attributes for POWER7 · Dave Kleikamp <hidden> · 2008-07-07
Re: [patch 0/6] Strong Access Ordering page attributes for POWER7 · Joel Schopp <hidden> · 2008-07-07
Re: [patch 0/6] Strong Access Ordering page attributes for POWER7 · Benjamin Herrenschmidt <benh@kernel.crashing.org> · 2008-07-07

Re: [patch 0/6] Strong Access Ordering page attributes for POWER7

From: Joel Schopp <hidden>
Date: 2008-07-07 21:23:26
Also in: linux-mm

quoted

We haven't defined a user-visible feature bit (and besides, we're really
getting short on these...). This is becoming a bit of concern btw (the
running out of bits). Maybe we should start defining an AT_HWCAP2 for
powerpc and get libc updated to pick it up ?

Joel,
Any thoughts?

Is it a required or optional feature of the 2.06 architecture spec?  If it's required you could just use that.  It doesn't solve the problem more generically if other archs decide to implement it though.

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